208 



Copper and Copper-base Alloys 



90 

 80 

 70 



c 60 



L. 

 (U 



Q.40 



XJ 



o30 

 o 



2-20 



10 



400 500 600 700 800 900 1000 1100 1200 \500 

 Annealing Temp, in Deg.F ClHr.a+ Temp.) 



Chaht 53. — The effect of annaaling on the yield strength of 15 per 

 cent nickel-silver strip, previously cold-rollsd 6 B. & S. Nos. (50 per 

 cent reduction of area) from a grain siza of 0.100 mm. (66.18 % copper, 

 15.02 % nickel, balance zinc) (0.040-in. stock). 







0.008 



Q002 0.004 0.006 

 S+rain^ Inches per Inch 



Chart 55. — The effect of cold rolling on the stress-strain charac- 

 teristics of 15 per cent nickel-silver strip (0.040 in. thick) having a 

 ready-to-finish grain size of 0.015 mm.; 5,000-lb. capacity hydraulic 

 testing machine and Templin automatic extensometer accurate to 

 0.00001 in. used. (66.18 % copper, 15.05 % nickel, balance zinc.) 



100 

 £ 90 

 '^^ 80 



_i 



o 60 



o 



o 



~ 50 



x: 



"1^ 40 



QJ 



^ 30 

 ^ 20 

 ^ 10 







20 30 40 50 60 70 80 90 100 



Rockwell Hardness B yie'Eall lOOKg.Load 

 69 74 80 86 91 97 - 



Rockwell Hardness F /le" Ball 60. Kg. Load 

 67 71 74 77 80 84 87 90 93 



Rockwell Hardness 15 T /le'Eall 15 kfg. Load 

 29 36 43 50 57 64 70 76 82 



Rockwell Hardness JOT /i6"Bcill 30 Kg. Load 



Chart 54. — This chart can be employed to determine the approxi- 

 mate tensile strength and percentage elongation of 15 per cent nickel- 

 silver strip (66.18 % copper, 15.02 % nickel, balance zinc) when only 

 Rockwell hardness is known. It is accurate for all thicknesses between 

 0.020 and 0.080 in. within the given limits. 



Q002 0.004 0.005 0.008 



Strain^ Inches per Inch 



Chart 56. — The effect of cold rolling on the stress-strain charac- 

 teristics of 15 per cent nickel-silver strip (0.040 in. thick) having a 

 ready-to-finish grain size of 0.100 mm.; 5,000-lb. capacity hydraulic 

 testing machine and Templin automatic extensometer accurate to 

 0.00001 in. used. (66.18 % copper, 15.05 % nickel, balance zinc.) 



